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If no other instruction mentions an inline mark, we can get rid of it.
This normally happens when the inlined function is empty, or when all
of its code is folded into other instructions.

Also use consistent statement-ness for inline mark positions, so that
more of them can be removed in favor of existing instructions.

Update #29571
Fixes #31172

Change-Id: I71f84d355101f37a27960d9e8528f42f92767496
Reviewed-on: https://go-review.googlesource.com/c/go/+/170445


Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>